EP0187973A3 - Procédé et circuit pour empêcher la réception non-autorisée de signaux de télévision hachés - Google Patents

Procédé et circuit pour empêcher la réception non-autorisée de signaux de télévision hachés Download PDF

Info

Publication number
EP0187973A3
EP0187973A3 EP85116058A EP85116058A EP0187973A3 EP 0187973 A3 EP0187973 A3 EP 0187973A3 EP 85116058 A EP85116058 A EP 85116058A EP 85116058 A EP85116058 A EP 85116058A EP 0187973 A3 EP0187973 A3 EP 0187973A3
Authority
EP
European Patent Office
Prior art keywords
television signals
prevention
circuit arrangement
decryption
encrypted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85116058A
Other languages
German (de)
English (en)
Other versions
EP0187973A2 (fr
Inventor
Günter Dipl.-Ing. Noetzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Publication of EP0187973A2 publication Critical patent/EP0187973A2/fr
Publication of EP0187973A3 publication Critical patent/EP0187973A3/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
EP85116058A 1985-01-16 1985-12-17 Procédé et circuit pour empêcher la réception non-autorisée de signaux de télévision hachés Withdrawn EP0187973A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853501178 DE3501178A1 (de) 1985-01-16 1985-01-16 Verfahren und schaltungsanordnung zur verhinderung des unberechtigten empfangs verschluesselter fernsehsignale
DE3501178 1985-01-16

Publications (2)

Publication Number Publication Date
EP0187973A2 EP0187973A2 (fr) 1986-07-23
EP0187973A3 true EP0187973A3 (fr) 1987-12-23

Family

ID=6259918

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85116058A Withdrawn EP0187973A3 (fr) 1985-01-16 1985-12-17 Procédé et circuit pour empêcher la réception non-autorisée de signaux de télévision hachés

Country Status (2)

Country Link
EP (1) EP0187973A3 (fr)
DE (1) DE3501178A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3822345C1 (en) * 1988-07-01 1989-10-12 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De Method of improving coding security
DE3822354A1 (de) * 1988-07-01 1990-01-04 Siemens Ag Verfahren und anordnung zur verwuerfelung von bildsignalen
US5003591A (en) * 1989-05-25 1991-03-26 General Instrument Corporation Functionally modifiable cable television converter system
SE9301236L (sv) * 1993-04-15 1994-10-16 Erik Rickard Soederqvist Sätt och anordning för koordinerad kodning och avkodning av en TV-signal eller annan meddelande signal
DE4420970A1 (de) * 1994-06-16 1995-12-21 Esd Vermoegensverwaltungsgesel Entschlüsselungseinrichtung von Entschlüsselungsalgorithmen und Verfahren zur Durchführung der Ver- und Entschlüsselung derselben
DE19619299A1 (de) * 1996-05-13 1997-12-18 Siemens Ag Schlüsselverteilung im FDDI-Übertragungsnetz

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097894A (en) * 1976-11-01 1978-06-27 Tanner Electronics Systems Technology, Inc. Secured scramble decoder filter
US4215366A (en) * 1977-10-19 1980-07-29 Feature Film Services Subscriber-limited reception television broadcast security encoder-decoder system
EP0127381A1 (fr) * 1983-05-27 1984-12-05 M/A-Com Government Systems, Inc. Système de cryptage et de distribution d'un signal de cryptage pour cryptage commandé et décryptage sélectif à distance de signaux de télévision
EP0155762A2 (fr) * 1984-03-15 1985-09-25 Titan Linkabit Corporation Système de production de clés de désembrouillage pour abonnés utilisant des semences de clés stockées dans le dispositif de désembrouillage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115662A (en) * 1975-06-06 1978-09-19 Etablissement Public Dit Telediffusion De France One way data transmission system
IL63102A (en) * 1980-06-19 1984-03-30 Oak Industries Inc System for enciphering messages
CA1177558A (fr) * 1982-04-15 1984-11-06 Groupe Videotron Ltee. (Le) Systeme de transmission de donnees par reseau cable
US4531020A (en) * 1982-07-23 1985-07-23 Oak Industries Inc. Multi-layer encryption system for the broadcast of encrypted information
AU564502B2 (en) * 1983-06-10 1987-08-13 General Instrument Corporation Address-programmable catv converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097894A (en) * 1976-11-01 1978-06-27 Tanner Electronics Systems Technology, Inc. Secured scramble decoder filter
US4215366A (en) * 1977-10-19 1980-07-29 Feature Film Services Subscriber-limited reception television broadcast security encoder-decoder system
EP0127381A1 (fr) * 1983-05-27 1984-12-05 M/A-Com Government Systems, Inc. Système de cryptage et de distribution d'un signal de cryptage pour cryptage commandé et décryptage sélectif à distance de signaux de télévision
EP0155762A2 (fr) * 1984-03-15 1985-09-25 Titan Linkabit Corporation Système de production de clés de désembrouillage pour abonnés utilisant des semences de clés stockées dans le dispositif de désembrouillage

Also Published As

Publication number Publication date
EP0187973A2 (fr) 1986-07-23
DE3501178A1 (de) 1986-07-17
DE3501178C2 (fr) 1987-11-05

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Inventor name: NOETZEL, GUENTER, DIPL.-ING.